there are background defragmentation hidden inside kernel. Also there are a lot of other disk activity inside kernel - paging, other similar tasks. Also MacOs encryption/decryption is also a part of kernel. So chances are that if you have damaged filesystem, FileVault encryption and encrypted paging file in some combination - you can get to this digits of load on kernel task.

Appreciate your input dmidimon, but I'm not an advanced macbook pro user. Is there anything that you can tell me in layman's terms to try to diagnose whats causing the kernel to be so intense on the CPU useage, and what can be done to fix it?

Linc Davis: Again, thanks for taking the time to read my post and reply. I did as you said and there were no results when filtered on smcHandleInterruptEvent. I've done a screenshot just so you can see that I was doing it all correctly:

Any other suggestions guys?

Just so you are all aware - rebooted into the Recovery Partition (where the fan was still constantly running at highspeed, but was unable to check figures on teh activity monitor as it's disabled as far as I'm aware?).

I repaired the normal boot partition, and all other partitions as well. Still no change at all.

This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.

Step 1

The purpose of this step is to determine whether the problem is localized to your user account.

Enable guest logins* and log in as Guest. For instructions, launch the System Preferences application, select Help from the menu bar, and enter “Set up guest users” (without the quotes) in the search box. Don't use the Safari-only “Guest User” login created by “Find My Mac.”

While logged in as Guest, you won’t have access to any of your personal files or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.

Test while logged in as Guest. Same problem?

After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.

*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

Step 2

The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:

Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.

When you see the gray Apple logo, release the shift key.

If you are prompted to log in, type your password, and then hold down the shift key again as you click Log in.

Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs.

The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

*Note: If FileVault is enabled, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode.

Test while in safe mode. Same problem?

After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of steps 1 and 2.

More Like This

Retrieving data ...

This site contains user submitted content, comments and opinions and is for informational purposes only.
Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the efficacy of any proposed solutions on the community forums.
Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.